using the mn3207 and mn3102

[the dude]

I was going to build the ce-2, but I only have a mn3207 and the mn3102, I checked the data sheets and they are very similar to the mn3007 and the mn3101. Before I start building this, has anyone substituted the mn3007/mn3101 for the mn3207/mn3102? I think it should work just want to know if anyone else has done this with success.

[Barcode80]

i have a mn3005 instead of a 3007, wondering the same thing. i have the tl022 and the mn3101 though.

[Mark Hammer]

These two chips can NOT be used as pin-for-pin replacements for the MN3007 and 3101,  They CAN be used as replacements, but the power connections on the board need to be adapted to suit the reverse polarity of the two different sets of chips.

The 32xx series was intended for use with lower supply voltages.  In particular, since the 3207 can work great with a 5v supply, it meant that something like an onboard 78L05 5v regulator could be used to provide a stable 5v until the 9v battery faded down to just over 7vdc.  That, in turn, would mean that whatever you set your bias voltage to for the BBD would be appropriate over the life of the battery (i.e., once the battery faded down to 7v, it probably wasn't gonna have enough juice for the rest of the circuit anyways).  With the MN3007, if it was powered with a 9v battery and 9v supply line, then whatever you tweaked the bias trimpot to might not be optimal once the battery started to fade.  The 3007 would likely have more headroom than the 3207 if the supply could be held stable at 9v, 15v or whatever, but when the two chipsets go head to head under 9v battery circumstances, the 3207 comes out ahead in terms of reliability of service.